EP2990777A1 - Device and method for detecting properties or the filling level of a medium in a vessel - Google Patents

Abstract

The present invention relates to a detection device for detecting properties of a medium (3) or the level of the medium (3) in a container (2) with a sensor unit (9) through which the medium flows with at least one pressure sensor (11) for detecting Pressure values of the medium in the sensor unit and for outputting a detection signal, wherein the sensor unit is insertable into a process system (P), in which the medium is located, and the process system at least the container for receiving the medium and a pump (5) for removal the medium from the container, and wherein the sensor unit is insertable between the container and the pump. One method relates to the detection of the pressure values and a corresponding evaluation for determining information as a measure of the level of the medium or other properties thereof.

Description

The present invention relates to a detection device and a detection method for detecting properties of a flowing medium, and more particularly to a detection device and a detection method for detecting properties of a viscous medium and the level of the medium in a container.

Devices and methods for detecting material properties, and for example for detecting material properties of a medium or for detecting a level of a medium in a container are known from the prior art.

The publication EP 2 533 035 A1 discloses an apparatus and an associated method for detecting material properties, wherein a measuring device has a sensor device which is directly in communication with the medium and which is controlled accordingly, so that by means of impedance spectroscopy information regarding general or specific properties of the medium is obtained. The control of the measuring device takes place in conjunction with predetermined frequency ranges for detecting the impedance of the sensor device with the medium and evaluation of the impedance values.

The publication DE 10 2007 059 853 A1 discloses a device for measuring a level of a liquid in a container, wherein two tube pieces are assembled by means of a connector to form an angular tube assembly of the device. The pipe sections may have a slot for establishing a flow connection with the surrounding medium. The level measurement takes place on the basis of ultrasonic signals, the transit times emitted and reflected signals are detected and evaluated. Depending on the determined transit times, it is possible to obtain running paths of the ultrasonic signals and, in conjunction with the entire volume of the container, respective filling level values.

A similar, based on the detection of transit times of ultrasonic signals determination of a level is from the document US 2005/284217 A1 known. The detection device has an angular arrangement of tubes and includes a special reflector device with a predetermined distance to the source of the ultrasonic signals, so that reference information can be generated.

A similar concept is also the publication WO 2007/118677 A1 removable, wherein also an angular arrangement is provided. The fill level information is obtained via an evaluation of the propagation time values of the ultrasonic signals with an additional temperature compensation.

Further, the document discloses JP 2001/240200 A a device for detecting the level in a container on the basis of determined pressure values in a line system. Specifically, in a conduit leading away from the container with the thin liquid medium to be detected, means are arranged which are suitable for detecting pressure values, and the medium is passed on to a point of consumption in which a pump is arranged. The pressure sensor is located between the tank or container with the medium and the pump. There is a pressure detection, always positive pressure values are recorded and is closed from the pressure values on the level of the container. The known procedure causes a detection of the pressure in the undisturbed state of rest, whereby pressure fluctuations due to the operation of the pump can be prevented. The device in which the pressure sensor is arranged and which is flowed through by the medium, therefore, has further mechanical means by which the undesired pressure fluctuations at the pressure sensor as a result of the operation of the pump are mitigated or largely prevented. It should only in the operating pauses of the pump at a trouble-free lasting static state of the pressure be measured. Measurements are thus limited to special operating states of the overall system.

In the known arrangements and devices described above for detecting material properties and the level of a certain substance or a fluid medium in a container, it is generally necessary to insert certain devices (measuring devices, measuring elements) into the container or to design the container in a special way, so that the necessary measurements, usually in conjunction with special measuring cycles, are possible. For example, a sensor device may be provided, which detects a flow of a medium by means of a heated resistor (PTC resistor), in which a cooling of the PTC resistor and in the self-regulating property of the PTC resistor, a current increase can be detected at a flow of the medium. It can be determined in this way, a complete emptying of the container of the medium.

Such methods and devices generally require a greater amount of effort, with one device always being used to detect the level in the container, or the container requiring a special configuration with special features, resulting in a complex design of the container and simply designed containers , as for example standard containers (usually of different types) for storing the medium, can not or can only be used with further measures. Thus, the respective level measurement is on the one hand connected to a greater effort and on the other hand with special facilities, which also special measurement times are required for the measurement. Also, for example, the detection of the level of a viscous medium in a container by means of a float in a mechanical manner due to the behavior of the viscous medium is not sufficient accurate and reliable.

The present invention is based on the object, a detection device and a detection method for detecting the properties of a fluid medium in such a way that properties of the medium including the level of the medium in a container in a simple manner and can be detected accurately.

According to the invention this object is achieved with the features indicated in the appended claims.

The present invention thus relates to a detection device for detecting properties of a medium or the level of the medium in a container with a sensor unit through which the medium flows with at least one pressure sensor for detecting pressure values of the medium in the sensor unit and for outputting a detection signal Sensor unit can be used in a process system in which the medium is located, and the process system at least the container for receiving the medium and a pump for removing the medium from the container, and wherein the sensor unit is inserted between the container and the pump.

Alternatively, the present invention relates to a detection device for detecting properties of a medium or the level of the medium in a container, with a flowed through by the sensor unit with at least one pressure sensor for detecting pressure values of the medium in the sensor unit and for outputting a detection signal, and a A pump for removing the medium from the container, wherein the detection device is insertable into a process system in which the medium is located, and the process system comprises at least the container for receiving the medium, and wherein the detection device with respect to the flow direction of the medium in the process system is disposed downstream of the container and the sensor unit is located between the pump and the container.

The method for detecting medium or medium level characteristics in the container from the above-described devices comprises the steps of: intermittently operating the pump with a pumping operation and pauses in operation (step 1), detecting the pressure values of the medium during the pumping operation and during breaks and provision of detection signals (step 2), forming a pressure characteristic from the time profile of the detected pressure values of the medium in the sensor unit (step 3), and evaluating the pressure characteristics for determining information as a measure of the level of the medium in the container from the pressure values of the respective Pressure characteristic during or outside pump operation (step 4).

With the arrangements according to the invention and the method it is possible to obtain with a comparatively simple arrangement information about the properties of the fluid medium, and in particular of the viscous medium. The arrangement according to the invention in connection with the method allows the detection of the properties of the medium or the level of the medium in an associated container (reservoir) in a simple and accurate manner, without facilities in the container are fixed or separable and without the container a special equipment needed. Rather, the desired information can be obtained regardless of the type of container and its equipment, wherein the detection device is not disposed in the container. This favors the use of simple container shapes without special equipment, so that even simple standard containers can be used for storing the medium. It is only necessary that there is a knowledge of the type and design of the container and is taken into account in the evaluation of the received detection signals.

The information regarding, for example, the viscosity of the medium in question or the level of the medium in the container can be obtained in connection with a running or intermittent operation of the pump (pump operation), if for example by means of a corresponding pump a certain amount of the medium removed from the container becomes. Regardless of the type of container, information may be obtained during pump operation and during pump pauses as to whether the level of the container is constantly changing during pump operation and other characteristics of the medium. It is not necessary to provide special measuring cycles in terms of time or technology, since continuous detection during pump operation and outside of it and thus during emptying of the Container is possible without additional effort and at the same time the nature of the container and its execution has no relevance. It is only necessary that the container is known in terms of its dimensions. Additional facilities or measuring times are not needed. The process to which the medium in question is supplied by means of operation of the pump for further processing or use is not affected or disturbed. Thus, the process is easily performed concomitantly with the removal of the medium from the container and does not require any additional equipment or detection times to acquire the required information regarding the level and other parameters of the medium.

As a result, when using the arrangement and the method according to the invention, neither additional measuring cycles are required with a time expenditure for carrying out the measurement and evaluation, nor a corresponding additional equipment of the containers for storing the medium, so that an exact detection of the properties of the medium and the Level of the medium is ensured in a container in a simple manner in terms of technology and time and very cost. In contrast, the known detection devices described above require properties of the medium or the level of the container with the medium both additional facilities and, if necessary, additional detection times and special conditions for the detection of measured values.

Further embodiments of the present invention are specified in the appended subclaims.

The detection device may further comprise a control device, which is designed to receive the detection signal of the sensor unit and to form pressure characteristics of the ascertaining pressure curve in the sensor unit.

The pump for removing the medium from the container may be operated intermittently, and the determined pressure curve may include pressure values of the medium in the sensor unit during operation of the pump and outside of the operation of the pump.

The control device may have a device for evaluating the pressure curve of the medium within the sensor unit, and for determining information as a measure of the level of the medium in the container from the pressure values of the determined pressure curve during or outside the operation of the pump.

The sensor unit may further comprise a temperature sensor for detecting the temperature of the medium in the sensor unit, and wherein the medium is a viscous medium having a viscosity greater than that of water, and the detection device is insertable into conduits of the process system.

In the method, the step of evaluating the pressure characteristic may include forming differences from respective pressure values of the pressure characteristic during or outside the operation of the pump.

In the method, the step of evaluating the pressure characteristic for determining the information as a measure of the level of the medium in the container may include forming differences from respective initial and final pressure values during or outside the operation of the pump.

Further, in the method, the step of detecting the pressure values of the medium in the container by the sensor unit may include continuously detecting the pressure values during and out of operation of the pump.

Fig. 1

eine schematische Darstellung eines Prozesssystems in Verbindung mit der Erfassungsvorrichtung gemäß einem ersten Ausführungsbeispiel in der beispielhaften Anordnung zwischen einem Vorratsbehälter für das zu erfassende Medium und einem Prozess, in dem das Medium verwendet wird,

Fig. 2

eine Anordnung einer Sensoreinheit an einer von dem zu erfassenden Medium durchströmten Leitung,

Fig. 3

eine grafische Darstellung einer grundlegenden Kennlinie eines Druckverlaufs, die aus einem Erfassungssignal der Sensoreinheit während des Betriebs einer Pumpe zur Förderung des Mediums gebildet ist,

Fig. 4

eine schematische Darstellung einer weiteren Kennlinie eines Druckverlaufs aus den Erfassungssignalen der Sensoreinheit mit weiteren Angaben zur Erfassung des Füllstands in einem Behälter und der Erfassung eines vollständig entleerten Zustands des Behälters,

Fig. 5

eine schematische Darstellung eines Prozesssystems, wobei die Erfassungsvorrichtung gemäß einem zweiten Ausführungsbeispiel als ein Modul mit mehreren Komponenten ausgebildet ist, und

Fig. 6

eine vereinfachte und schematische Darstellung der Anordnung der Sensoreinheit in einem von dem Medium durchströmten Leitungssystem, wobei die Sensoreinheit eine Mehrzahl von Sensorelementen oder Sensoreinrichtungen aufweist.

The invention will be described below with reference to embodiments with reference to the drawings. Show it:

Fig. 1

a schematic representation of a process system in connection with the detection device according to a first embodiment in the exemplary arrangement between a reservoir for the medium to be detected and a process in which the medium is used,

Fig. 2

an arrangement of a sensor unit on a line through which the medium to be detected flows,

Fig. 3

4 is a graphical representation of a basic characteristic curve of a pressure profile formed from a detection signal of the sensor unit during the operation of a pump for conveying the medium;

Fig. 4

a schematic representation of another characteristic of a pressure profile of the detection signals of the sensor unit with further information for detecting the level in a container and the detection of a completely empty state of the container,

Fig. 5

a schematic representation of a process system, wherein the detection device according to a second embodiment is designed as a module having a plurality of components, and

Fig. 6

a simplified and schematic representation of the arrangement of the sensor unit in a flowed through by the medium line system, wherein the sensor unit comprises a plurality of sensor elements or sensor devices.

Description of preferred embodiments First embodiment

The present invention will be described below with reference to FIGS Fig. 1 to 4 described. In detail, in connection with the representation in the Fig. 1 and 2 the arrangement and construction of the detection device according to the invention and their integration into a technical environment, for example in a process system P, described in detail according to a first embodiment.

According to Fig. 1 the detection device 1 is inserted into the process system P and may be separate therefrom or else part of the process system P. Starting from the process system P in a very general form is in a container (for example, a reservoir or tank) 2, a medium 3, which is a fluid medium and is preferably in the form of a viscous medium, wherein the viscosity of the medium 3 is higher than that of water. The medium 3 forms in the container 2 a level height 4, which corresponds to a liquid level in liquids.

By means of the detection device 1 physical properties and partially chemical properties of the medium 3 are determined, and it can also determine the level of the medium 3 in the container 2. An instantaneous level (corresponding to a liquid level) is exemplified as a current level 4. The detection takes place during the ongoing operation of the process system P.

The process system P further comprises a pumping means 5, hereinafter referred to simply as pump 5, for conveying the medium 3 from the container 2 to any process 6 forming part of the process system P. In detail, the detection device 1 is arranged with respect to the flow direction of the medium 3 between an outlet of the container 2 and an inlet of the pump 5. Between the container 2 and the detection device 1, between the detection device 1 and the pump 5 and between the pump 5 and the process 6 respectively connecting lines are arranged, in which the medium 3 can flow. The connection lines will be referred to simply as lines 7 below. In general, during a normal, d. H. trouble-free and especially a steady state operation of the process system P, the lines 7 almost completely filled with the medium 3. The lines 7 may be formed as pipes and / or hoses for the passage of the medium 3.

The process 6 is very general in the context of the present invention. It may be the process 6, a corresponding physical or chemical process (for example, in the context of a process engineering), the medium 3, which is conveyed by the pump 5 from the container 2 to the process 6, in physical and / or chemical manner converts or used in a special form as an adjuvant. It may also be the process 6 only another container in which the desired amount of the medium 3 is arranged or stored. In this case, the process 6 can also be a corresponding packaging process for the medium 3 for introducing the medium 3 into a container suitable for sale. The present invention is not defined in any of these non-exclusive possibilities.

The present invention can thus be applied in industrial facilities in which the medium 3 from a first container (corresponding to the container 2 in FIG Fig. 1 ) in another container (corresponding to process 6 in FIG Fig. 1 ) or is supplied to the process 6 in the form of corresponding operations. This applies in particular to the packaging industry or the chemical industry. Furthermore, the present invention can also find application in household appliances, for example when viscous media are supplied to the process 6. In this connection, in order to simplify the illustration, the present invention will be described with reference to washing devices (washing machines) which can be used in private households or also in industry.

In detail, without limitation thereto, the description in connection with the measure, from a detergent container (corresponding to the container 2) inside or outside of the washing device to supply a viscous detergent to the process 6 in the form of the washing process. In this case, the supply can take place in a controlled or regulated manner, it being possible to control or regulate corresponding quantities of detergent supplied. The present invention is not limited to the use in a washing device, but various applications in the manner described above are conceivable.

For controlling the entire processes of the process system P, the detection device 1 has a control device 8, which in Fig. 1 Also referred to as electronic data processing device EDP. The controller 8 includes electronic circuits and computer devices for the acquisition of data and also for influencing the execution of processes of the process system P, for the control or regulation of certain measures of the detection device 1, for controlling certain devices for carrying out these measures and for recording detection results in the form of data. This data can also be stored and displayed to a user. The control device 8 can also be connected to a further central control device 8 (not shown in the figures) and to be dependent on commands of this central control device 8 in a predetermined manner.

In the illustration according to Fig. 1 the detection device 1 further comprises a sensor unit 9 inserted into the lines 7 for detecting a plurality of physical and in the broader sense also chemical properties of the medium 3 and the level 4 of the medium in the container 2. The sensor unit 9 as part of the detection device 1 is thus located When viewed in the flow direction of the medium 3 upstream of the pump 5 and thus between the pump 5 and the container 2. If the medium 3 is conveyed by the pump 5 and thus removed from the container 2 and fed to the process 6, then the medium 3 flows out of the container 2 via the line 7 to the sensor unit 9, and after flowing through the sensor unit 9 via the line 7 to the pump 5 and from the pump 5 via the line 7 to the process. 6

The control device 8 is connected to the sensor unit 9, the pump 5 and the process 6 in electrical terms with respect to corresponding drives and the acquisition of data, so that with the control device 8 in response to a predetermined computer program substantially the sensor unit and, if necessary, the pump 5 are controlled. By means of the sensor unit 9 corresponding detection data or parameters to be detected (continuous detection and individual values) arranged in the sensor unit 9 and described below are recorded in the form of detection signals and transmitted to the control device 8 for evaluation and storage or provided for evaluation. In the control device 8 usable characteristics can be used in the evaluation (hereinafter referred to as pressure characteristics) are formed from the detection signals.

The pump 5 has known properties, such as the delivery rate in terms of a delivered amount of substance per unit time, as well as the possible producible pressure values (negative or positive pressure), so that in connection with a corresponding operation of the pump 5 in the processing of the detection signals by the control device At least approximately one piece of information about the quantity of substance of the medium 3 conveyed by the pump 5 can be taken into account.

Fig. 2 shows a detailed representation of the sensor unit 9, wherein the sensor unit 9 may have in general form a plurality of individual sensor elements. The present illustration in Fig. 2 shows by way of example the sensor unit 9 with a temperature sensor 10 for detecting the temperature of the medium 3 flowing through the sensor unit 9, ie for detecting the temperature of the medium 3 within the sensor device 9, and a pressure sensor 11 for detecting the pressure of the medium 3 within the sensor unit 9, which is inserted between the lines 7 and flows through the medium 3.

Is by an operation of the pump 5 according to Fig. 1 the medium 3 is removed from the container 2 and flows through the medium 3 via the lines 7 through the sensor unit 9, then the corresponding physical values are determined by means of said sensor elements (10, 11). By means of the temperature sensor 10, the current in the region of the sensor unit 9 prevailing temperature of the medium 3 is determined, and it is the result of the operation of the pump 5 (pump operation) a frequently changing pressure of the medium 3 within the sensor unit 9 (in the environment or also in the vicinity of the pressure sensor 11) detected. Corresponding data in the form of the detection signals are fed to the control device 8 for evaluation storage and / or display.

For conveying the medium 3, the pump 5 is temporarily controlled by the control device 8 or the central control device (not shown) of the process system P. During operation of the pump 5, the medium 3 from the container 2 and flows through the lines 7 and the sensor unit 9. With the arrangement of the pump 5 downstream of the sensor unit 9, taking into account in the Fig. 1 and 2 indicated by arrows flow direction of the medium 3, the pump 5 generates on the side of the sensor unit 9 and the container 2, a negative pressure corresponding to the preferably viscous medium 3 from the container 2 into the conduit 7 and flows through the sensor unit 9.

The flow rate of the medium 3 depends on the viscosity of the medium 3 and the temperature of the medium 3 and the negative pressure applied by the pump 5 (negative pressure). In connection with the operation of the pump 5 and the corresponding pauses in operation, a continuous detection of the pressure of the medium 3 within the sensor unit 9 results in widely varying pressure conditions (pressure values), these values essentially resulting in negative pressure and thus negative pressure values. The pressure values are considered relative to the ambient pressure.

Fig. 3 in this context shows a pressure characteristic K1 as a pressure variation over time or a multiplicity of detected pressure values, as recorded, for example, by the pressure sensor 11 in the sensor unit 9 as part of the detection device 1. The pressure characteristic K1, which also represents a measure of the delivery characteristic of the pump 5, is shown in FIG Fig. 3 Areas A1 to A7 (time range or time duration) in which the pump 5 is operated by a corresponding control (for example by means of the control device 8) and conveys the medium. During the areas A1 to A7 is thus corresponding to the in the Fig. 1 and 2 indicated flow direction, the medium 3 from the container 2 via the lines 7 through the sensor unit 9 to the process 6 promoted.

In Fig. 3 the horizontal axis denotes the time and the vertical axis a pressure in units of pressure (Pascal P in N / m ² or bar) or in converted units of a height, for example, of a water column (eg millimeters of water), the latter being expressed in terms of a conversion factor in equivalent pressure values can be converted. The characteristic K1 according to Fig. 3 (and the second one below) described characteristic K2 according to Fig. 4 ) have emerged from measurements on a test setup.

The characteristic K1 also shows areas T1 to T6 (time ranges, time ranges) in which the pump 5 is not operated or which represent the operating pauses of the pump 5. From the short time range T7 (also time), the pump 5 is in the in Fig. 3 simplified and schematically illustrated example of the operation of the pump 5 off.

According to Fig. 3 and the pressure characteristic K1 starts after the time T0 during the time range A1, the operation of the pump 5. The starting point for the pressure values is the pressure P0 before the start of the operation of the pump 5 in the area A1. This is the initial pressure, which is generally the external air pressure (preferably the ambient pressure) and thus does not represent overpressure or vacuum. With the pause in operation in the area T1 after the first area A1, the pressure P1 results, and after the further operation of the pump 5 in the area A2, the pressure P2 arises during the area T2. Similarly, after different operating times of the pump 5 during the ranges A3, A4, A5 and A6 in the respective pauses T3 to T6, the corresponding pressure values P3 to P6 are obtained (P6 corresponds to a final value). It is assumed that in the operating pauses of the pump 5, ie in the areas T1 to T6, the reached and detected pressure remains approximately constant.

Thus, the pressure (of pressure values) of the medium 3 is detected by the sensor unit 9 during and / or outside the operation of the pump 5, preferably continuously.

With the discontinuous or intermittent operation of the pump 5 with successive times of operation of the pump 5 and pauses in operation, it is possible during the longer or shorter operating pauses of the pump 5 (areas T1 to T6), in which the pump 5 is not controlled, a measurement of the pressure, that is to carry out a pressure detection by the pressure sensor 11, since in this state, the medium 3 within the lines 7 and the sensor unit 9 is at rest and the pressure detection means of the pressure sensor 11 so not unwanted vibrations or random pressure fluctuations is distorted or unusable. It can thus be easily carried out during the short operating pauses of the pump 5 (during the times or areas T1 to T6) an undisturbed and thus very reliable pressure detection by means of the pressure sensor 11. In these time ranges according to the pressure characteristic K1 in Fig. 3 For example, the pressure sensor 11 can provide accurate and thus reliable pressure values with regard to the pressure of the medium 3 within the sensor unit 9, and especially of the negative pressure formed by the operation of the pump 5 (negative pressure values according to the pressure characteristic of FIG Fig. 3 ) to capture.

Assuming that the container 2, from which the medium 3 is removed by means of the operation of the pump 5, completely filled at time T0 (or even a short period of time) and almost completely emptied for a short period of time T6, then results in a short time or a time T7, that the medium 3 is completely removed and thus the negative pressure formed by means of the pump 5 decreases and thus the operation of the pump 5 is stopped. Without the medium 3 in the container 2, the lines 7 and the sensor unit 9 (stall) only a slight negative pressure can be built up, since no more viscous medium 3 can be promoted and the pump 5 draws substantially air, so that the negative pressure closer to the value zero (corresponding to the external pressure or ambient pressure) comes up. This is in Fig. 3 not shown because the measurement was canceled. The further approximate course of the pressure characteristic is indicated only by dashed lines.

The representation in Fig. 3 shows the pressure values, and in particular negative pressure values over time, wherein in the time ranges A1 to A6 each of the pump 5 is operated. This is recognizable by the time-compressed representation of individual pump cycles and, thus, associated pressure fluctuations with a predetermined amplitude during the ranges A1 to A6. The amplitude of the pressure fluctuations caused by the pump 5 is dependent on the viscosity of the medium 3, and the greater, the greater the viscosity. During operation of the pump 5, an increased negative pressure is created for delivery of the medium 3, so that, for example, an average negative pressure value P1 in the region A1 in terms of amount is considerably larger than the output pressure P0 (initial pressure value). In the same way, the approximately defined negative pressure over the range A2 (ie during this time duration) is greater than the negative pressure P1 during the pause of the operation of the pump 5 between the ranges A1 and A2. With each operation of the pump 5 in the areas A1 to A6 after a respective more or less short break in operation, the pressure value or the value of the negative pressure (negative pressure) starts at a value higher in magnitude, and is in terms of magnitude after further operating cycles of the pump fifth further increased (in the pressure characteristic with the pressure curve over time according to Fig. 3 and right-angled).

Thus, with respect to the respective negative pressure values during the operation cycles of the pump 5 (regions A1 to A6) and the operation pauses (regions or times T1 to T6), there is a stepwise increase of the negative pressure (the negative pressure) from the pressure characteristic K1 according to FIG Fig. 3 recognizable. The stepwise increase in the amount of negative pressure or vacuum provides a measure of the level of the medium 3 in the container 2 prior to removal, during removal from the container 2 and thereafter (extensive or complete drainage), so that in a known container , ie with known dimensions (including shape design) and quantities of the container 2, from which the medium 3 is removed, can be closed on the level 4 of the medium 3 in the container 2 during the removal.

This is also in Fig. 3 shown. The output assuming a completely filled with the medium 3 container 2 leads to the first pressure value P0 before the start of the first range A1 of the operation of the pump 5 (generally the ambient pressure). The further pressure values P1 to P6 of the determined pressure curve in the respective operating pauses of the pump 5 (ranges T1 to T6) are shown in FIG Fig. 3 a decreasing tendency and thus a magnitude increase of the negative pressure (negative pressure), wherein in the state shortly before a complete emptying of the container 2, the pressure value at P6 is detected by the pressure sensor 11. Let the first detected pressure value P0 be an initial pressure value and the last detected pressure value, for example the pressure value P6 a final pressure value.

Since thereafter detected pressure values tend to be zero, the pressure value at P6 represents the last pressure value of the negative pressure (negative pressure) in the sensor unit 9 in connection with the delivery of the medium 3, so that in the evaluation of the detection signals on the basis of a Difference between the pressure value P0 and the pressure value P6 (ie, between the initial pressure value and the final pressure value) a difference X1 is formed, which is a measure of the level 4 of the container 2. With knowledge of the type of container 2 and in particular its shape for receiving the medium 3, intermediate values of the pressure (for example the values P2 and P3) can also be determined to determine a level between a completely filled and a completely empty container 2. The difference X1 thus represents a first difference and is formed of the pressure values P0 and P6 in the operating pauses of the pump 5 (ranges T1 to T6) and the initial value P0 of the pressure before the operation of the pump 5 (ie between the initial pressure value P0 and the Final pressure value P6).

Similarly, a second difference X2 may be formed from the pressure values at the beginning and end of the entire operating ranges of the pump 5 (i.e., ranges A1 to A6 in which the pump 5 is operated). If an upper value A11 or a lower value A12 is considered at the beginning of the range A1 and these values are respectively compared with an upper value A61 or the corresponding lower value A62, then it is likewise possible to choose between the values A11 and A61 and the values A12 and A62 (FIG. ie between the associated initial pressure value and the final pressure value), taking into account the respective pressure conditions prevailing at that time, a second difference X2 is formed, which is the same or similar to the first difference X1, so that either with the first difference X1 or the second difference X2 accurate measure of the level 4 of the medium 3 in container 2 can be determined.

For the detection of the pressure values of the negative pressure or negative pressure in the sensor unit 9 as a result of the operation of the pump 5 or the pauses in operation, it is irrelevant whether the container 2 is arranged higher or lower than the sensor unit 9 or the pump 5. Is the container second arranged higher than the detection device. 1 or the pump 5, then the hydrostatic pressure generated by the medium 3 favors the removal of the medium 3. With the decrease of the amount of the medium 3 in the container 2, this support for the removal of the medium 3 goes back, so that it is necessary that the pump 5 must form an increased negative pressure in order to convey the (preferably viscous) medium 3 in the manner described above, whereby the gradual decrease of the pressure characteristic K1 according to FIG Fig. 3 corresponding to the pressure values P0 to P6 or the corresponding negative pressure values A11, A12, A61, A62 in connection with the operation of the pump 5 occurs. The trajectory of the pressure characteristic K1 falling in the illustration means an increase in the negative pressure due to the decrease in the support of the removal of the medium 3 from the container 2 when the container 2 (which is higher than the detecting device 1 and the pump 5) cyclically continues is emptied.

However, if the container 2 is arranged below the detection device 1 and the pump 5, then it is necessary to generate an increased negative pressure by the pump 5 for sucking the medium 3 for emptying the container 2, so that likewise with the further emptying of the container. 2 and a reduction of the hydrostatic pressure in the container 2, the negative pressure (negative pressure) increases in amount. The amounts of the pressure values of the pressure characteristics resulting in this geometrical situation are somewhat higher in this case.

In both cases, the in Fig. 3 shown pressure characteristic K1 gradually decrease, so that in any case, regardless of the arrangement of the container 2 relative to the detection device 1 and the pump 5, the first difference X1 and / or second difference X2 can be formed, resulting in knowledge of the dimensions and design (form) of Container 2 can be closed on the level 4.

If, for example, the container 2 has straight or even (vertical or oblique) side walls, essentially linear relationships are present, and those in the illustration according to FIG Fig. 3 decreasing pressure characteristic K1 allows the formation of the first difference X1 and / or the second difference X2 for determining the level 4, wherein a linear interpolation between the completely filled and complete deflated condition of the container 2 is possible. If, on the other hand, the container 2 has a different shape, in conjunction with the knowledge of the shape of the container 2 in the evaluation and determination of intermediate values of the filling level 4, a computational effort is required to obtain exact intermediate values.

In Fig. 3 the two possibilities of the difference X2 from either the different pressure values A11 and A61 or A12 and A62 are shown. The pressure difference between the respective values A11 and A12 and A61 and A62 denotes the pulsating pressure change due to the operation of the pump 5, and these pressure changes, and in particular the changes in the negative pressure within the sensor unit 9, are detected accordingly. The representation in Fig. 3 (as well as in the below described Fig. 4 ) shows the temporally compressed pressure changes due to pump operation.

Fig. 4 shows a further pressure characteristic K2, which has a similar structure as the first pressure characteristic K1 according to Fig. 3 , The further pressure characteristic K2 is formed in the same way as the first pressure characteristic K1 and represents a detected or determined in the sensor unit 9 pressure curve over time. It is also assumed in the case of the further pressure characteristic K2 that the medium 3 medium with a medium Viscosity (higher than that of water) and the container 2 geometrically on the detection device 1 and the pump 5 (and thus increased) is arranged. In the same way as in Fig. 3 designated in Fig. 4 the horizontal axis the time and the vertical axis a pressure in units of pressure (Pascal P in N / m ² or bar) or in converted units of a height, for example a column of water (eg millimeters of water), the latter being converted into equivalents by means of a conversion factor Pressure values can be converted.

In connection with this geometric arrangement, the further pressure characteristic K2 is partly in the positive pressure range and partly in the negative pressure range (thus in the negative pressure range). The parts of the further pressure characteristic K2, which in the positive pressure range according to Fig. 4 are the operating pauses of the pump 5, ie the shorter or longer periods in which the pump 5 is not operated. The arrangement of the container 2 over the detection device 1 and the pump 2 causes the medium 3 with medium or lower viscosity already forms a hydrostatic pressure in the lines 7 and the sensor unit 9, so that this hydrostatic pressure, which becomes lower with increasing emptying of the container 2, can be detected as a positive pressure on the pressure sensor 11 of the sensor unit 9 is. It occurs this hydrostatic pressure in the idle state of the pump 5, ie in the operating pauses of the pump 5.

However, if the pump 5 is operated and causes the pump 5 during operation, a suction and further conveying of the medium 3 from the container 2 via the line 7 through the sensor unit 9 (as shown in FIG Fig. 1 ), then it requires due to the viscosity of the medium 3 of a corresponding negative pressure, which is shown as a negative pressure in the further pressure characteristic K2 during the pumping operations (during operation of the pump 5) and detected in a corresponding manner by the sensor unit 9 of the detection device 1 ,

In the representation of the further pressure characteristic K2 according to Fig. 4 (detected pressure values over time) denotes a time range B0 the initial measures, for example, after putting into operation a filled with the medium 3 container, such as the container 2, wherein the pump 5 is operated so that a portion of the medium 3 from the container 2 is taken and thus at the beginning for operation with a reliable pressure sensing the line 7 and the sensor unit 9 are filled with the medium 3.

In a similar manner as in the representation of the first pressure characteristic K1 according to Fig. 3 B1 to B8 denote the usual desired or controlled operation of the pump 5 in an intermittent manner, wherein the individual time ranges B1 to B8 as shown in FIG Fig. 4 may have a different duration. The time-compressed pressure changes, as they are generated by the pump 5 during its operation and as detected by the sensor unit 9 and the pressure sensor 11, are again present in the illustration.

The other areas C1 to C9 designate in a similar manner as in Fig. 3 the operating pauses of the pump, ie the areas C1 to C9 are time ranges, in where the pump 5 is not operated. In any case, however, takes place by the sensor unit 9 and the pressure sensor 11 contained therein, a continuous pressure detection for forming the further pressure characteristic K2 according to Fig. 4 over the entire time the representation of the further pressure characteristic K2, ie in temporal areas of the operation and outside of the operation of the pump. 5

In a range B9 and C10, it can be seen with regard to the operation of the pump 5 and the detection of the pressure values by the sensor unit 9 that the container 2 is now completely or almost completely emptied as a result of the gradual emptying, so that air is sucked in substantially by the pump 5 and thus the pressure values detectable by the sensor unit 9 approach the value zero, since only a slight negative pressure due to the flow resistance of the air in the line 7 and the sensor unit 9 is detected. It is then switched off the pump 5.

From the further pressure characteristic K2, information regarding the filling level 4 of the container 2 can also be determined starting from a completely filled state up to a completely empty state. Depending on the type and shape of the container 2 intermediate values can also be interpolated in a reliable manner.

For determining information from the further pressure characteristic K2 according to Fig. 4 as a measure of the level of the connected container 2 can in the same manner as in accordance with Fig. 3 corresponding pressure differences of determined pressure values (positive or negative pressure values) are used in conjunction with the first pressure characteristic K1. This is also in Fig. 4 illustrated.

On the one hand, the plurality of pressure values of the respective areas C1 to C9 can be used during the operating pauses of the pump 5, the difference between the (in the present case positive) pressure value at C1 (initial pressure value) and the pressure value at C9 (final pressure value) a first difference Denoted D1, which is a measure of the level 4 of the medium 3 in the container 2. It is assumed that the pressure value determined by the sensor unit 9 at C1 (Initial pressure value) denotes the completely filled container, while the pressure value determined by the sensor unit 9 at C9 (final pressure value) designates the container 2 completely (or almost completely empty with tolerances). Depending on the nature of the container 2 and its geometric shape, an intermediate value of the filling level 4 can be determined in a simple manner by means of simple interpolation or by appropriate calculation in the case of an uneven shape of the container 2.

Similar level information can also be obtained from the upper or lower pressure values (in the present case respectively determined negative pressure values) of the operating ranges of the pump 5, which in Fig. 4 with B0 to B8 (time ranges, operation of the pump 5) are designated. Taking into account the respective lower determined pressure values, for example the pressure values at the beginning of the region B1 and the end of the region B8 (corresponding initial and final pressure values), information as a measure of the total filling level 4 of the container 2 and depending on the container shape for the container possible intermediate values are obtained. It is this as difference D2 in Fig. 4 designated. Similarly, the respective upper pressure values of the varying pressure fluctuations in the operation of the pump 5 (ie, in the regions B0 to B8) may be used for the determination of level information, the resulting difference between the respective initial pressure value (at B0) and the final pressure value (at B8) with D3 in Fig. 4 is designated. With a homogeneous medium 3 and a uniform operation of the pump 5 (ie with approximately the same power), the differences D2 and D3 are approximately equal.

It is performed in the same way as in the measuring process according to Fig. 3 (First pressure characteristic K1) on the one hand a pressure detection or an evaluation of the detected pressure values of the areas C1 to C9 carried out so that the evaluation of a determined during an at least short resting pressure value allows accurate pressure measurement, which is not distorted by random pressure fluctuations. Serve for this again the operating pauses of the pump 5, ie the time ranges C1 to C9, in which the pump 5 is not operated and thus can not cause pressure fluctuations.

On the other hand, the pressure sensing during operation of the pump 5 (ie in the areas B0 to B8) gives approximately the same accurate results, by means of a detection especially in the areas B0 to B8 according to FIG Fig. 4 (and in the same way also in the areas A1 to A6 according to Fig. 3 ) nachstehen still described further properties of the relevant medium 3 can be determined.

In the above description of the making and the statements of the first and second pressure characteristics K1 and K2 according to the Fig. 3 and 4 the possibility has been described to obtain information from various areas of the respective pressure characteristic K1 or K2 as a measure of the level 4 of the container 2, starting, for example, from the completely filled state of the container 2 via possible intermediate states to the completely empty state. In addition to this information regarding the level 4 of the container 2, it is also possible to obtain information regarding the viscosity of the medium 3 as a further property.

The medium 3 is a liquid with a medium or greater viscosity, so that it is necessary for the pump 5 to at least temporarily generate a negative pressure (negative pressure) for conveying the medium 3 by the pump 5, so that the Medium 3 can be sucked in and out of the container 2 via the lines 7 and the sensor unit 9. The viscosity of the medium 3 is further dependent on the temperature, so that in each case a detection result of the temperature sensor 10 is used in the evaluation of the first and second pressure characteristic K1 and K2, so that the evaluation of the first and second pressure characteristic K1 and K2 is temperature-compensated , As the temperature of that of the medium 3 is used within the sensor unit 9, since the temperature sensor 10 detects the temperature of the medium 3 in the sensor unit 9 and in the immediate vicinity.

In known properties of the components, such as the shape and content of the container 2 and the performance and in particular the delivery rate of the pump 5 can change the viscosity of the medium 3 by evaluating the corresponding measured values (temperature-compensated Pressure values, for example, according to the first and / or second pressure characteristic K1 or K2) are closed. If the viscosity of the medium 3 changes or if a different type of medium 3 having a different viscosity than a previous medium 3 is used as the medium 3, this can be done in conjunction with the previously stored measured values, which designate a specific medium 3 having a specific viscosity, be determined. Specifically, it can be determined from a comparison of pressure values whether the viscosity has changed when the pump 5 is operated for a predetermined period of time and certain pressure values are detected. For a medium 3 having a higher viscosity, an increased negative pressure is required in comparison to the delivery of a medium 3 with a lower viscosity (ie, a medium 3, which is less viscous).

It can be determined in this way by evaluation of detected pressure characteristics, such as the first and second pressure characteristic K1 and K2 preferably during and / or outside the operation of the pump 5, a (primary relative) measure of the viscosity of the pumped medium, so that Also, in a simple manner and without the use of additional facilities, the properties of the medium 3 and thus to some extent its quality can be monitored. For this purpose, pressure values and preferably pressure characteristics which have been determined under predetermined conditions can be stored for a subsequent comparison with more recent pressure characteristics. The prerequisite for this is the knowledge of the properties and design of the respectively involved components, such as the container 2 and the pump 5, notwithstanding that the type and shape of the container 2 is not fixed, as far as it is known in the application and evaluation of the pressure characteristics.

As a result of the above description of the detection device 1, it is possible to obtain information regarding the characteristics of the medium 3 in question, and further information regarding the level 4 of the container 2 in which the medium 3 is located and from which it is taken , There is no need for additional facilities inside or outside the container 2 for detecting this information or data, so that in a simple manner, a detection of basic data with the detection device 1 is ensured. With the For example, detecting information regarding the viscosity of the medium 3 may determine whether the properties (eg, quality) of the medium have changed, whether an improper or inappropriate medium may be used, or the medium has changed undesirably (e.g. By admixtures, chemical and / or physical changes).

Thus, while the detection of the pressure values for the formation of the pressure characteristics K1 or K2 continuously during and outside the operation of the pump 5, the evaluation relates to a separate consideration of the detected pressure values or the corresponding sections of the pressure characteristics K1 and K2 in the respective areas either during the Operation of the pump 5 (areas A1 to A6 and B0 to B8) or outside the operation of the pump 5 (areas P0 to P6 and C1 to C9).

In the in Fig. 1 shown process system P is for conveying the medium 3 from the container 2 to the process 6, the pump 5 is required, so that for obtaining the desired data (characteristics) only the detection device 1 is inserted into the process system P. The detection device 1 is thus designed in such a way that it can be inserted into the process system P. The control of the detection device 1 or the sensor unit 9 by means of the control device 8 is carried out according to the Fig. 3 and 4 in connection with the control of the pump 5, so that in the areas (pause times) T1 to T6 or in the areas C1 to C9 respectively reliable measurements can be performed, which are not affected by an operation of the pump 5. Also, the detection by means of the sensor unit 9 of the process 6 running in the process system P (which thus represents a higher-level process) is not impaired or disturbed.

The operating pauses of the pump 5 (ranges T0 to T6; C0 to C9) on the one hand and the times of operation of the pump 5 (ranges A1 to A6; B1 to B8) on the other hand thus result from the normal and trouble-free operation of the entire process system P overall Time window for carrying out the measurements (acquisitions) Figures 3 and 4 ). Further additional components or functional components are not required for detecting the filling level 4 of the container 2 or the further properties, such as the viscosity of the medium 3 used. Furthermore, the Relative position of the container 2 with respect to the detection device 1 and the pump 5 of less importance, since this affects only the absolute values of the detection signals and characteristic curves formed therefrom. The basic course of the characteristics, such as the first and second pressure characteristic K1 and K2 (pressure over time) of Figures 3 and 4 remains substantially preserved, so that the above-described evaluation with respect to parameters of interest of the medium 3 and / or in connection with the container 2 can be made.

The measures for the method already given in connection with the above description are summarized again below.

The method for detecting properties of the medium 3 or the level of the medium 3 in the container 2 is based on the above-described device according to the FIGS. 1 and 2 and comprises the following steps: Intermittent operation of the pump 5 with a pump operation and pauses in operation (step 1), for example for removing the medium from the container, detecting the pressure values of the medium 3 during the pump operation and in the pauses and providing detection signals (step 2) Forming a pressure characteristic K1, K2 from the time course of the detected pressure values of the medium 3 in the sensor unit 9 (step 3), and evaluating the pressure characteristics for determining information as a measure of the level of the medium 3 in the container 2 from the pressure values of respective pressure characteristic during or outside the operation of the pump 5 (step 4). The method steps are initiated and controlled by the control device 8.

In detail, in conjunction with the evaluation of the pressure characteristics K1 or K2, the formation of the above-described differences X1, X2; D1, D2, D3 from respective pressure values during or outside the operation of the pump 5. The differences are thereby formed from respective initial and final pressure values (for example P0, P6, A11, A12, A61, A62) during or outside the operation of the pump 5. Individual pressure values can be detected, but preferably the continuous detection of the pressure values during and outside the operation of the Pump 5, so that a complete respective characteristic K1 or K2 can be formed, which can then be evaluated in terms of a variety of aspects and parameters of the medium 3.

As described above, the detection device 1 and the detection method can be applied to a plurality of containers 2, and the application of the invention is not limited by the type and shape of the container 2. It is only necessary that the shape and design of the container 2 is known, so that from the pressure values (for example, the pressure values P0 to P6 according to Fig. 3 ) During the operating pauses of the pump 5 or the pressure values during operation of the pump 5, a serving as a measure of the level 4 information can be obtained. It may further be considered that at least a small amount of the medium 3 may adhere to the inner walls of the conduits 7, the container 2 and the sensor unit 9 due to its viscosity, since the viscosity is greater than that of water, and is preferably significantly greater than that of water.

Referring again to the illustration of, for example, the pressure characteristic K1 in FIG Fig. 3 At the pressure values P0 to P6, a connection line between these pressure values during the pauses of the pump 5 can be approximated by the pressure values P0 determined within the respective associated range T0 to T6 (and for longer time ranges, for example at the range T2 at the beginning of this range) until P6 are connected to each other with a line. The information to be obtained and its evaluation are described below.

If, for example, the container 2 for receiving the medium 3 comprises substantially straight or planar walls and a predominantly regular structure, substantially straight lines also result in the connection of the respective pressure values, for example the pressure characteristic K1 (and likewise at K2 in FIG Fig. 4 ), so that intermediate values with regard to the level of the medium 3 to be determined in the container 2 can be interpolated in a simple manner. In contrast, the container 2 has no or only partially a regular structure, but conical or in otherwise narrowing portions or changes the cross-sectional area of the container 2 continuously or at certain points in the container 2 in stages or abruptly with respect to the housing shape due to three-dimensionally shaped walls, and thus changes the occupied by the medium 3 cross-sectional area also abruptly, then more or less strongly curved lines appear (with continuous change) or straight lines occur, which meet at an acute angle, if there is an abrupt change in the housing shape of the container 2. The evaluation of the detection signals of the sensor unit 9 (or the pressure values and pressure characteristics K1 and K2) thus takes place with knowledge of the shape of the container 2, ie its mechanical configuration and thus also its volume.

Thus, if the container 2 exhibits an abrupt change in at least its internal shape (abrupt change in the cross-sectional area, usually in the lower region of the container 2), then the pressure values P0 to P6 of the first pressure characteristic K1 according to FIG Fig. 3 or the pressure values C1 to C9 of the second pressure characteristic K2 according to Fig. 4 two straight lines are formed, which meet at an acute angle at the pressure value, from which in the further removal of the medium 3 from the container 2, the level 4 of the medium has dropped below the area of the container 2, the substantially straight (flat ) Has walls and now the conically converging part of the container 2 begins with the consequent faster decrease of the medium 3 with otherwise similar removal.

To illustrate this issue are in Fig. 3 two straight lines drawn, a first straight line G1, which connects the points P0 to P4, and a second straight line G2, which connects the pressure values P4 to P6 with each other. The pressure value in connection with the time T7 can not be used for this detection, since in this state the container 2 is already (or nearly) completely emptied and the pressure goes back to only the sucked air pressure through the lines 7 of the process system P approaches an approximate normal ambient pressure corresponding to the external air pressure to which the process system P is exposed.

It is determined by means of a differentiation or a corresponding algorithm, the respective slope of the in conjunction with the pressure values at the operating pauses of the pump 5 of the approximated straight lines G1 and G2, and it is here the break point of the straight line as an abrupt change of the slope or abrupt change of Detection of the level 4 in the container 2 determined, the second straight line G2 at about the same removal amount by the operation of the pump, a faster decrease in the level in the container 2 referred to as the first straight line G1.

It is possible in this way to complete the detection of the level of the medium 3 in the container 2 such that with the recognition of reaching the break point of the straight line G1 and G2 and thus reaching a level of the medium 3 in the container 2 in the area the abrupt change in the shape of the container 2, a user can be pointed out that the container 2 is with the medium 3 just before the complete emptying. In this case, by the evaluation by means of the control device 8 in good time and before the actual complete emptying of the container an alarm is issued that shortly the container 2 will be completely emptied.

After complete emptying, for example at time T7 (short duration) in Fig. 3 For example, the pump 5 can only suck in air through the sensor unit 9 and the line 7 and through the container 2, so that the then remaining pressure value close to the zero pressure value represents a measure of the flow resistance of the air in the entire system, in this way depending can be detected by the resulting low residual pressure (during operation of the pump 5 in the suction substantially of air or other gas in the process system P), whether the container 2 has a pressure compensation device, which type is the pressure compensation device and with which flow resistance for the air is the pressure compensation device of the respective container 2 afflicted.

It can be determined with this procedure in a known and stored in the control device 8 flow resistance of a particular container 2 and related thereto pressure characteristics of the medium in question, whether this or a spare container is used, for example, whether a foreign replacement container is used instead of an original replacement container of a particular manufacturer with a more or less different shape. By means of the arrangement of the detection device according to the invention (comprising at least the sensor unit 9 and the control device 8 according to the first embodiment) can thus be determined extensive data regarding the medium 3 and the container 2 and its current level, without additional measurement times or additional facilities are required. Furthermore, the process 6 running in the process system P is not impaired and in particular is not delayed with respect to required acquisitions.

Second embodiment

Fig. 5 shows a second embodiment of the detection device 20, wherein the detection device 20 according to Fig. 5 in the same way as in Fig. 1 is used in the process system P. The detection device 20 is located in this case between the container 2, in which the medium 3 is stored, and the process 6, the medium 3 via the lines 7 (pipes, hoses) is supplied.

In contrast to the arrangement according to Fig. 1 the detection device 20 of the second embodiment is constructed in such a way that in the form of a structural unit, an assembly or a module, the sensor unit 9 and the pump 5 are combined in a housing. Furthermore, the control device 8 is provided for direct control, which is also part of the detection device 20 in the form of a module. The module of the detection device 20 is thus in the same way as the detection device 1 according to Fig. 1 can be used in the process system P, wherein it is also possible to provide a connection to a central data processing device 12. The central data processing device 12 (in Fig. 5 : Central EDP) can send commands to the control device 8 of the module of the detection device 20 and further implement user instructions and also affect the process 6. The process 6 corresponds to the general process 6 as described in connection with the arrangement according to FIG Fig. 1 ,

The operation of the detection device 20 in the form of in Fig. 5 shown module is the same as that of the detection device 1 according to Fig. 1 in connection with the pump 5, wherein the same advantages can be achieved and the same captures and associated evaluations described above can be performed. With the arrangement according to Fig. 5 the further advantages are achieved that the detection device 20 (comprising at least the sensor unit 9, the control device 8 and the pump 5 according to the second embodiment) in the form of the module can be manufactured as a compact unit, so that further a simple assembly and a extensive manufacturing is guaranteed with the aim of a compact design.

The sensor device 9 and the pump 5 in the module of the detection device 20 are in the same way as in FIG Fig. 1 is shown connected to each other, so that the sucked by the pump 5 medium 3, the lines 7 and the sensor device 9 flows through and is supplied via the pump 5 and further lines 7 to the process 6. Thus, notwithstanding the fact that the sensor device 9 and the pump 5 are arranged together in the detection device 20 (ie in a housing), the sensor device 9 with respect to the flow direction of the medium 3 between the pump 5 and the container 2 in terms of function and thus upstream to the pump 5. The pump 5 is located downstream relative to the sensor device 9 in the flow direction of the medium 3, so that similar conditions are provided as in Fig. 1 are shown. The same or similar pressure characteristics can be recorded for evaluation with regard to the viscosity of the medium 3 and the level 4 of the medium 3 in the container 2, as they by the first and second pressure characteristic K1 and K2 according to Fig. 3 and 4 are shown and described.

Modifications of the first and second embodiments

In the illustration according to Fig. 2 is shown in a simplified and schematic manner, the sensor unit 9, wherein the sensor unit 9 as an example substantially two Sensor elements, on the one hand the temperature sensor 10 and on the other hand, the pressure sensor 11. It is with the in Fig. 2 shown sensor unit 9 information with respect to the temperature of the medium 3 and the pressure of the medium 3 (positive or negative pressure) determined within the sensor unit 9.

However, according to a further embodiment of the present invention, the sensor unit 9 has further sensor elements which, for the purpose of simplification, in FIG Fig. 2 not shown.

Fig. 6 shows in this context a modified embodiment of the sensor unit 9 in the form of the sensor unit 90, wherein the sensor unit 90 next to the temperature sensor 10 and the pressure sensor 11 further comprises, for example, a turbidity sensor 13, which serves for detecting, for example, a density or a degree of contamination of the medium 3. The turbidity sensor 13 may be formed, for example, as an optical sensor. It is controlled by means of the control device 8 and can have opposing elements through which a light is transmitted, wherein an incident light quantity represents a measure of a specific density or turbidity of the medium 3.

The sensor unit 90 may further comprise a conductivity sensor 14, by means of which the electrical conductivity of the medium 3 flowing through the sensor unit 90 is detected. The medium 3 is located inside the sensor unit 90 in a measuring chamber 15 which is completely or almost completely filled with the medium 3, so that the conductivity sensor 14 is in direct contact with the medium 3. By means of the conductivity sensor 14 can be made on the detected conductivity of the medium 3, a statement about its nature or changes in the nature. The application of the conductivity sensor 14 is possible with an electrically conductive medium.

The sensor unit 90 may further comprise a capacitive sensor element 16, by means of which, in conjunction with an impedance spectroscopy, physical and chemical properties of the medium 3 arranged in the measuring space 15 can be detected. In this case, by the capacitive sensor element 16 specifically the detected dielectric properties of the medium 3 by 16 alternating voltage signals with different frequency or different frequency ranges are applied to the opposite parts of the capacitive sensor element. Depending on previously determined reference values, properties of the medium 3 or changing properties can be accurately deduced.

In Fig. 6 is shown by means of appropriate arrows a preferred flow direction of the medium 3, wherein the flow of the medium 3 by the in the illustration Fig. 6 arranged on the right and in Fig. 6 not shown pump 5 is effected. Furthermore, the illustration in Fig. 6 simplified and schematic. The invention is not fixed to the arrangement and positioning shown and the number and design of the individual sensor elements in the sensor devices 9 and 90.

By means of the sensor unit 90 in the form of a multi-sensor with a multiplicity of different sensor elements, it is possible to obtain comprehensive data concerning the relevant medium 3 without an additional technical outlay and only with the arrangement of the relevant or desired (required) sensor elements in the sensor unit 90. The sensor unit 90 according to Fig. 6 may be part of the detection device 1 according to the first embodiment or part of the detection device 20 according to the second embodiment. It may also be considered that at least a small amount of the medium 3 may adhere to the inner walls of the conduits 7, the container 2 and the sensor unit 9 due to its viscosity.

In any case, it is not necessary to provide corresponding means for obtaining the desired data in the container 2, so that advantageously according to the present invention, the container 2 may be a standard container, or even a container with relatively simple equipment, so that sensor devices in can be dispensed with the container 2. With the possibility that the detection device 1 or 90 according to the first or second embodiment can be used in the process system P, without influencing or even disturbing the process system itself, There is the possibility to easily obtain the required data within the process system P and with a relatively low technical effort. Special versions of the respective container 2 for storing the medium 3 and before the evaluation of detection results, the provision of special detection times are not required. Rather, all observations are accompanied by the process 6.

The present invention has been described above with reference to embodiments and modifications thereof. The invention is not limited to the illustration and in particular not to the arrangements and proportions shown in the figures. Rather, all embodiments and variants are considered as belonging to the invention, which fall under the appended claims.

Claims (10)

Detecting device for detecting properties of a medium (3) or the level of the medium (3) in a container (2), with - One of the medium (3) flows through the sensor unit (9) with at least one pressure sensor (11) for detecting pressure values of the medium (3) in the sensor unit (9) and for outputting a detection signal, wherein - The sensor unit (9) in a process system (P) can be used, in which the medium (3) is located, and the process system (P) at least the container (2) for receiving the medium (3) and a pump (5) for removing the medium (3) from the container (2), and wherein - The sensor unit (9) between the container (2) and the pump (5) can be inserted. Detecting device for detecting properties of a medium (3) or the level of the medium (3) in a container (2), with - One of the medium (3) flows through the sensor unit (9) with at least one pressure sensor (11) for detecting pressure values of the medium (3) in the sensor unit (9) and for outputting a detection signal, and - A pump (5) for removing the medium (3) from the container (2), wherein - The detection device (1) in a process system (6) can be used, in which the medium (3) is located, and the process system (P) at least the container (2) for receiving the medium (3), and wherein - The detection device (1) with respect to the flow direction of the medium (3) in the process system (P) downstream of the container (2) is arranged and the sensor unit (9) between the pump (5) and the container (2). Detection device according to claim 1 or 2, further comprising a control device (8) which is designed to receive the detection signal of the sensor unit (9) and to form pressure characteristics (K1, K2) of the ascertaining pressure curve in the sensor unit (9). Detection device according to claim 3, wherein the pump (5) for removing the medium (3) from the container (2) is operated intermittently, and the determined pressure curve pressure values of the medium (3) in the sensor unit (9) during operation of the pump ( 5) and outside the operation of the pump (5). Detection device according to claim 4, wherein the control device (8) comprises means for evaluating the pressure curve of the medium (3) within the sensor unit (9), and for determining information as a measure of the level (4) of the medium (3) in the Container (2) from the pressure values of the determined pressure curve during or outside the operation of the pump (5). Detection device according to one of claims 1 to 5, wherein the sensor unit (9) further comprises a temperature sensor (10) for detecting the temperature of the medium (3) in the sensor unit (9), and wherein the medium (3) with a viscous medium a viscosity greater than that of water, and wherein the detection device (1) in lines (7) of the process system (P) can be used Method for detecting properties of a medium (3) or the level of the medium (3) in a container (2), wherein a sensor unit (9) through which the medium (3) flows comprises at least one pressure sensor (11) for detecting pressure values of the Medium (3) in the sensor unit (9) and the Output of a detection signal, and a pump (5) for removing the medium (3) from the container (2) are provided, and
the method comprising: - intermittent operation of the pump (5) with a pump operation and breaks (step 1), Detecting the pressure values of the medium (3) during the pump operation and during the pauses in operation and providing detection signals (step 2), - forming a pressure characteristic (K1, K2) from the time profile of the detected pressure values of the medium (3) in the sensor unit (9) (step 3), and K2) for determining information as a measure of the level of the medium (3) in the container (2) from the pressure values of the pressure characteristic (K1; K2) during or outside the operation of the pump (5) ( Step 4). The method of claim 7, wherein the step of evaluating the pressure characteristic (K1; K2) comprises forming differences (X1, X2; D1, D2, D3) from respective pressure values during or outside of operation of the pump (5). Method according to claim 7, wherein the step of evaluating the pressure characteristic (K1; K2) for determining the information as a measure of the level of the medium (3) in the container (2) comprises forming differences (X1, X2; D1, D2, D3 ) from respective initial and final pressure values (PO, P6, A11, A12, A61, A62) during or outside the operation of the pump (5). A method according to claim 7, wherein the step of detecting the pressure values of the medium (3) in the container (2) by the sensor unit (9) comprises continuously detecting the pressure values during and outside the operation of the pump (5).

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